.box {
  width: 200px;
  height: 400px;
}
.box > div {
  height: 300px;
  background-color: teal;
  margin: 10px;
}
.box > div > div {
  background-color: orange;
  margin: 10px;
  height: 200px;
}
.box > div > div > div {
  height: 100px;
  margin: 10px;
  background-color: orchid;
}
